The NAS, the effects of marijuana cigarettes on blood pressure are complex, depending on dose, administration, and attitude.
Marijuana cigarettes often produces a temporary, moderate increase in blood pressure immediately after ingestion, but heavy chronic doses to some extent blood instead. A common response to reduced blood pressure while standing and cause increased blood pressure when lying down, making people faint when they stand too quickly. There is no evidence that pot use causes persisting hypertension or heart disease and some users even claim that it helps them control hypertension by reducing stress.
THC is one thing to increase the heart rate for approximately one hours. This is generally not harmful, since exercise does the same, but it can cause problems for people with preexisting heart disease. Chronic users may develop a tolerance for this and other cardiovascular reactions
